TW-128

- TW-128 new helper command; _envs. Actually no, not a new command, but the
  $TASKRC and $TASKDATA environment variables are now show in the 'diag'
  command output.

src/commands/CmdDiagnostics.cpp

@@ -210,6 +210,18 @@ int CmdDiagnostics::execute (std::string& output)
       << location.mode ()
       << "\n";
 
+  char* env = getenv ("TASKRC");
+  if (env)
+    out << "     TASKRC: "
+        << env
+        << "\n";
+
+  env = getenv ("TASKDATA");
+  if (env)
+    out << "   TASKDATA: "
+        << env
+        << "\n";
+
   out << "    Locking: "
       << (context.config.getBoolean ("locking")
            ? STRING_CMD_DIAG_ENABLED